| I. Polygonal, Pyramidal, and Figurate Numbers |
| II. Linear Diophantine Equations and Congruences |
| III. Partitions |
| IV. Rational Right Triangles |
| V. Triangles, Quadrilaterals, and Tetrahedra |
| VI. Sum of Two Squares |
| VII. Sum of Three Squares |
| VIII. Sum of Four Squares |
| IX. Sum of n Squares |
| X. Number of Solutions of Quadratic Congruences in n Unknowns |
| XI. Liouville’s Series of Eighteen Articles |
| XII. Pell Equation |
| XIII. Further Single Equations of the Second Degree |
| XIV. Squares in Arithmetical or Geometrical Progression |
| XV. Two or More Linear Functions Made Squares |
| XVI. Two Quadratic Functions of One or Two Unknowns Made Squares |
| XVII. Systems of Two Equations of Degree Two |
| XVIII. Three or More Quadratic Functions of One or Two Unknowns Made Squares |
| XIX. Systems of Three or More Equations of Degree Two in Three or More Unknowns |
| XX. Quadratic Form Made an nth Power |
| XI. Equations of Degree Three |
| XXII. Equations of Degree Four |
| XXIII. Equations of Degree n |
| XXIV. Sets of Integers with Equal Sums of Like Powers |
| XXV. Waring’s Problem and Related Results |
| XXVI. Fermat’s Last Theorem |
| Indexes |